regenerate has 7 distinct synonyms spread across 4 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is unregenerate.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
amplify (an electron current) by causing part of the power in the output circuit to act upon the input circuit
return to life; get or give new life or energy
“The week at the spa restored me”
replace (tissue or a body part) through the formation of new tissue
“The snake regenerated its tail”
form or produce anew
“regenerate hatred”
undergo regeneration
restore strength
“This food revitalized the patient”
reformed spiritually or morally
“a regenerate sinner”
Synonyms, antonyms and the broader and narrower relations for regenerate come from Princeton University’s WordNet. Full sources and licences.